Valve for automatically stopping the supply of liquid to pipes upon breaking of the latter.



r E. MEIER. VALVE FOR AUTOMATICALLY STOPPING T HE SUPPLY OF LIQUID T0 PIPES UPON BREAKING OF THE LATTER.

I APPLICATION FILED SEPT-18,1913- I 1,153,5, PatentedSept. 14, 1915.

377/27 PSS S.

ERNST MEIER, oF NEtinnc Ku-M, GERMANY.

VALVE roe AUToMATICALLYi'hTOPPING.THF;SUPPLY or LIQUID 'ro rirns BREAKING-or THE LATIER.

UPON

Specification of Letters Patent. Patented Sept. 14, 1915,

Application filed September 12, 1913. Serial No. 790,479.

To all whom it may concern: Be it known that I, ERNST MEIER, a subjectiof the German Emperor, and resident of Neubeckum, Germany, have invented cer-' tain new and useful Improvements in Valves for Automatically Stopping the Supply, of Liquid to Pipes Upon Breaking of the Latter, of which the following is a specification.

.This invention relates to a valve for "liquids, which, upon breaking of a pipe, to

which the liquid is supplied through the valve, and consequent decrease of pressure,

closes automatically and thus stops the supply of liquid.

According to the invention, the flowing energy produced upon .a decrease of pressure taking place by the pressure changing into-speed, is 'used for closing the valve in such-a way that upon an excessivespeed at .a narrowest portion of the valve beyond the valve-plug the latter is closed.

Valves have already become known, in which the decrease of pressure is also changed into speed. The flowing energy thus obtained is, however, with such valves not used for closing the latter in order to stop the supply of liquid, but for controlling the valve only, that is to say for obpansible and thus entirely dilferent from non-compressible and non-expansible liquids from a physical'point of view.

To put the invention into. practice, a valve of that known type is used, in which the valve-plug is directly connected with a piston working in a cylinder, which at one end is in communication with the valve-' chamber in advance of the valveplug and at the other end with a double cone-shaped portion of the valve-chamber beyond the valve-plug. t

The improvements consist in making the piston spring-pressed in such a way that it normally keeps the valve-plug in open position and in perforating the piston so asto create apermanent communication between both cyllnder ends through said perforation and finally in so making the communication between the cylinder and the double-cone portion of the valve-chamber that the end ports of the same areconsiderably narrowed, so that a throttling is effected at these places,

whereby changes of pressure in the doublecone portion act on the piston in a weak way only and larger changes only effect a lmovement of the piston and thus 'of the valve-plug; while at theoutlet of the valvechamber a stop-cock is provided, for the purpose hereinafter explained.

The accompanying drawing shows the improved valve in a central longitudinal section.

Through the passage-way a of the valvecasing, liquid is to flow in the direction of arrows Zn The passage of the liquid through the valve casing is controlled by a valveplug 0, which is connected with a piston 01. The latter is at one side loaded by the full pressure of the liquid existing in advance of the valve-plug c, for which purpose the passage-way a in advance of the. valve-plug is, through a port f, in communication with the cylinder-space g outward of the piston d. The piston is, throu h its piston-rod, acted upon by a spring 5 which tends to bring the piston cl and thus the valve-plug 0 into the open position and to keep thev same normally open. A

,The passage-way a lying beyond the valve-plug c is narrowed at it in such a way that the passage-way presents on this side of thevalve-plug the shape of a double-cone having its narrowest diameter at h. The narrowed part b of the passa ge-waya is, through a channel k, in communication with the'cylinder-space g inward of the piston d.

Said communication is considerably narrowed at i and Z, so that a throttling is effected at these places, whereby changes of pressure in the narrowed part 72, act on the piston 01 in a weak wayonly and larger changes only effect a movement of the piston d and thus of the valve-plug 0.

Between the end of the valve-:casing-and the connection-pipe a a hand-operated stop-cock m is provided. The piston d has a small boring r for creating a permanent communication between the two cylinderspaces on bothsides of the piston.

The throttle openings i and Z are sodi-' mensioned that the load continuously acting upon the piston dcannot produce a closing of the valve-plug 0 unless the largest possible quantity of liquid flows through. If the latter is comparatively small, the valve a continuously maintains its approximate po sition owing to the throttling in the openings z' and Z.

Upon a break occurring in the pipe a a high decrease of pressure results at h and consequently also in the channel 70 and in that side of the cylinder-space connected therewith, whereby the valve-plug is moved toward its seat by the surpressure acting against the piston d in this direction, which acts also on the valve-plug, the valve being thus closed so that liquid ceases from flowing into the pipe a except that trifling portion, which isstill allowed to escape through the port f, boring 1', opening Z, channel is and opening 2'. To again open the valve after repair of the broken pipe, it is only necessary to close the stop-cock m fora short time, whereby through the boring 1' of the piston the pressure of the liquid on both sides of the valve-plug or of the piston respectively is gradually balaiiced. The valve-spring al then causes an automatic opening of the valve-plug c,

whereupon after opening the stop-cock m the pipe a is again fed with liquid.

I claim: A valve for automatically stopping the supply of liquid to pipes upon breaking of the latter, comprising in combination, a valve-chamber having a narrowed doublecone portion therein, a valve-plug in said chamber located in advance of the double cone portion, a cylinder connected at one end withsaid chamber in advance of the valve-plug and at the other end with said doublecone portion beyond the valve-plug, the latter communication having considerably narrowed end ports, a spring-pressed piston in said cylinder directly connected with said valve-plug and adapted to keep the latter normally in open position "and having a perforation therethrough to permanently connect both cylinder ends, and a stop-cock at the outlet of the valve-chamber, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of-two subscribing witnesses.

' ERNST MEIER.

\Vitnesses:

KARL HASPELMATH, T. HENDY REED. i 

